Add term multiplexin collagen trimer

[DaiqingChen]

Please provide as much information as you can:

• Suggested term label:
  Multiplexin collagen trimer

• Definition (free text)
  Collagen that contains multiple triple-helix domains with interruptions.

• Reference, in format PMID:#######
  Overview of collagen family classification: PMID: 21421911
  Multiplexin collagens: PMID: 31479735, PMID: 33543021, PMID: 27746220

• Gene product name and ID to be annotated to this term
  Collagen type XV trimer (GO:005582) and Collagen type XVIII trimer (GO:0030938)

• Parent term(s)
  Collagen trimer (GO:0005581)
  Collagenous component of basement membrane (NTR Add term Collagenous component of basement membrane #29472)

• Children terms (if applicable) Should any existing terms that should be moved underneath this new proposed term?
  Collagen type XV trimer (GO:005582) and Collagen type XVIII trimer (GO:0030938)

• Synonyms (please specify, EXACT, BROAD, NARROW or RELATED)
  None

• Cross-references

• For enzymes, please provide RHEA and/or EC numbers.

• Can also provide MetaCyc, KEGG, Wikipedia, and other links.

• Any other information
  See slides 1, 4, 9: https://docs.google.com/presentation/d/1zxL0gt5vOynmJsS8BP-Xqs_0sTaEB8Zo/edit?usp=sharing&ouid=109267399050361021326&rtpof=true&sd=true

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Slide screenshots:

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[Matrisome]

@DaiqingChen : please insert new screenshot of revised slides 1 and 4